DD293522A5 - DEBURRING TOOL WITH CUTTING KNIFE - Google Patents

Abstract

Described is a deburring tool having cutting blades for deburring the edges of through-bores on either side, having at least one cutting blade, consisting of a rectangular, edge-shaped cutting body having conically running cutting edges, undercut, sharpened flanks and an end bearing face on the cutter head for bearing against the inner surface of a bore. <??>The object of the invention is to make bevels to an accurately defined size on the front and rear side of through-bores by means of a deburring tool of the said type. <??>To this end, provision is made for a sliding portion deviating from the angle of the cutting edge to be formed in the direction of the axially outer part of the cutting blade, which sliding portion, furthermore, merges into a sliding radius formed at the end face.

Description

For this 3 pages drawings

Field of application of the invention

The invention relates to a deburring tool with cutting blade for deburring on both sides of the edges of through holes with at least one cutting knife, consisting of a rectangular, card-shaped cutting body with material-removing cutting edges, with undercut ground clearance surfaces and with an end abutment surface on the cutter head to rest against the inner surface of a bore.

Characteristic of the known state of the art

Such cutting blades are known from the patent DE-PS 2649208 of the applicant, the problem is based very controlled with exactly defined size to attach a chamfer on both sides of through holes.

Such cutting blades for deburring bores or for attaching bevels are preferably used in pairs, wherein in a rotationally driven tool holder in a rectangular receiving slot, the cutting blades are arranged opposite with radially outwardly facing conical cutting edges.

The cutting blades are pressed by a spring arranged in the interior of the tool holder by means of pins on a shaft to the outside, wherein the pins engage in a respective groove of the cutting body. As a result, the cutting blades are displaceable in the same direction in the radial direction. At rest, the cutting blades are initially extended radially outwardly under spring force. In working position when chamfering a hole are due to the effective feed of the tool holder

and because of the conical shape of the cutting edges, the cutting blades during chamfering of hole edges against the spring force shifted more and more radially inward until they finally not cutting in the area einos the front side of the

Schneidmossers attached sliding radius to reach the inner area of the hole.

The tool holder is then driven through the hole with the cutting blades to work with the working feed backward the rear edge of the hole.

For this purpose, the cutting knives have an additional cutting edge on an opposite side, so that after passing through the bore, the edge of the hole can be deburred and chamfered from the rear side with the same cutting profile but also in another feed direction.

However, with the previously known deburring tools or cutting tools, it was not possible chamfers with very high

Accuracy to install.

Explanation of the essence of the invention

Therefore, the present invention has the object, a deburring tool of the type mentioned in such a way that at through holes, both at the front and on the back, chamfers of well-defined size can be attached with great accuracy.

So far, it has not been possible to introduce chamfers in a precisely defined size, especially in soft material. For soft material, especially soft metals, z. B. through holes in thermoforming sheets or in other soft metals such. As copper, gold or the like. Or soft alloys provided, in which case it is particularly difficult to attach to the through holes bevels with well-defined size.

If the material is very soft, the cutting knives known tools work very aggressively and take correspondingly large chips from the edges of the through hole, which is undesirable in itself.

So far, one could only by finer control of the feed of the cutting tool in the longitudinal direction of the bore, and by reducing the pressure of the cutting blades on the edges of the hole trying to control the chip removal within narrow limits, thereby achieving clean and flat chamfers.

However, the result was often insufficient. In particular, there was no certainty that now one and the other of the so introduced chamfer were the same in shape and texture.

To solve the problem is therefore provided according to the invention that in the direction of the axially outer part of the cutting blade deviating from the angle of the cutting edge sliding part is provided, which in the further course in a front side of the

Cutting knife trained sliding radius passes. The core of the present invention is accordingly that the cutting edge is not directly rectilinear in the front side mounted

Sliding radius of the cutting blade passes, but that there is provided between the sliding radius and the cutting edge of an angled sliding section, which by definition does not cut, but only slides.

With the arrangement of a sliding part between the cutting edge and the frontal sliding radius several advantages are achieved simultaneously.

It is now possible for the first time to reproducibly form precisely defined chamfer sizes up to a tolerance of plus / minus 0.005 mm, in particular in which material.

Abtragtiefe, chamfer angle and chamfer shape are clearly determined by the combination cutting edge with the inventive radially outward of the cutting edge starting sliding.

When retracting the cutting tool in the through hole first come the cutting edges with the upper edge of the through hole in contact and carry the material from, in a first embodiment of the invention the cutting blade angle of the cutting edge to the vertical, determines the angle of the chamfer to the longitudinal axis of the bore and the Chip removal takes place parallel to the intended angle, while in a second embodiment of the invention of the cutting blade in relation to a fixed 90 ° angle of the cutting edge smaller angle of the sliding part to the vertical, determines the angle of the chamfer to the longitudinal axis of the bore and the chip removal is perpendicular to the lowering direction ,

Now that the cutting edges are bounded radially outward by the transition region in the sliding part, and automatically get out of engagement with the material after a predetermined sinking depth through the sliding part, the tool in the further course of work in the feed direction with the end faces of the knife against the bore wall fitting in the through-hole are retracted.

Since the distance of the passage region of one blade from the transition region of the other blade sets exactly the desired countersink diameter, bring the cutting edges of the two opposite arranged on the tool head cutting blade, the reduction also exactly to scale. This defines the chamfer exactly. If the tool moves further in the feed direction into the through hole, no material is removed. The sliding part and the front side of the respective knife subsequent sliding radius in contact with the bore wall hold the knife in the receptacle of the tool head against a radially outwardly acting on the knife spring force.

The further feed of the cutting tool leaves the tool head on the opposite side of the material to be processed exit, in which case the process described above is repeated, but opposite to the

Feed direction, that is, upon exiting the tool head from the through hole, the spring-loaded

Cutting knife brought into the extended starting position and incorporated in the reverse processing by the top of the knife provided, mirror image same arrangement of a cutting edge and merging into the frontal slide sliding a reduction in the bottom of the material.

Insofar as the heart of the invention in a combination of a known cutting edge with an adjoining, merging in the front side en Glsitradius the blade sliding part, which itself is not designed to be machined.

In a first embodiment of this invention, such an integrated in the tool head disordered, so-called Gleitschliffkanten and the desired lowering angle aligned cutting edges exhibiting cutting blade is provided, the cutting edge in a preferred embodiment at an angle of about 45 ° and its sliding portion at an angle of about 40 ° Vertical is arranged.

By this arrangement of the two edges, these differ by a certain angle. This angle amount

from Z. B. 5 ° is therefore preferred to easily grind the cutting edge without affecting the sliding part in this case and, moreover, this gives the sliding a stronger conical shape, so that the onset of

Cutting knife in dio through hole is facilitated. In a further embodiment, it is provided that with respect to the cutting edge a Spanleitkante is provided, wherein

An angle is formed between the edges such that the chip-guiding edge widens conically from the cutting edge.

This design ensures that chips do not settle on the cutting edges or of the cutting edges and the

Sliding part are easily rejected, so that always ensures the free damage-free working of the tool

In a particularly preferred embodiment, it is provided that the angle between the cutting edge and Spanleitkante has a range of 5 ° to 10 °.

A good chip removal is given when the Spanleitkante occupies an angle of about 40 ° in the direction of the vertical. To be able to bring in subsidence, which not only ablates the material at a certain angle to the longitudinal axis of the through hole according to the orientation of the cutting edge of the knife to the vertical and creates a straight line, flat chamfer surface, but the chamfer to be introduced on average also any other Form and any other angle to the longitudinal axis of the through hole can give unchanged straight cutting edge is provided in a second embodiment of this invention, also integrated in the tool head arranged cutting blade which removes the material at right angles to the feed direction of the tool, the angle to be introduced Chamfer to the longitudinal axis of the through hole and the shape of the chamfer is determined solely by the orientation of the sliding part to the vertical or by their shape, which then fitting against the chamfer form the spring-loaded knife in the feed direction d it presses tool head radially inward.

In the formation of such a MesGers is provided that the cutting edge of the perpendicular to the lowering direction cutting blade is arranged at an angle of 90 ° and the sliding part in an arbitrarily smaller angle to the vertical. The sliding part can be curved in the form of a straight line, concave, convex or irregular.

embodiments

The invention will now be explained in more detail with reference to exemplary embodiments, wherein all in the documents - including the summary - disclosed information and features, in particular in the drawings shown spatial formations are claimed as essential to the invention, as far as they individually or in combination over the prior art new and be inventive

 Show it

1: in section, a double through-hole, which is deburred with a deburring tool according to the invention or

to be chamfered; 2 shows a deburring tool according to the invention with ground cutting blades of a first embodiment in FIG

Arbe'tsposition; 3 shows a cutting blade according to Figure 2 in side view;

4 shows a section according to the line IWIV in Figure 2 with the additional representation of a pressure point screw. 5 shows a cutting blade of a second embodiment in side view; 6 shows the cutting blade of Figure 5 in a view in the direction of arrow Vi of Figure 5; FIG. 7 shows the cutting blade of FIG. 5 in a plan view in the direction of the arrow VII of FIG. 5; 8 shows the tool head with cutting blades of the first embodiment in the starting position with a schematic representation

the processing on the workpiece; 9: the tool head with cutting blades of the second embodiment in the starting position with a schematic representation of the processing on the workpiece.

The cutting tool 1 according to FIG. 1 consists, according to the earlier patent DE-PS 2649208 of the applicant, of a tool head which has a radially directed receptacle 11 at its lower frontal part, in which two mutually opposed cutting blades 8, 9 in the axial direction (relative to the respective cutting blade) or in the radial direction (relative to the cutting tool) are arranged adjustable.

The adjustment of the cutting blade 8,9 in the direction of arrows 21 takes place here according to Figure 4 under the action of a spring-loaded rocker 23 which has at its lower end side in each case a pin 24,25, each in a slot 27,28 each of a cutting blade 8, 9,37,38 intervene.

By rotation of the rocker 23 in the direction of arrow 29 so that the displacement of the cutting blade 8.9 in the Arrow directions 21 are adjusted according to Figure 2 and in the opposite direction thereto. The rocker 23 is spring loaded, i. in radially outward direction here is at least one bolt 24 at one

Pressure point screw 26, which is screwed into the tool body of the cutting tool 1. This is the in

Arrow direction 21 outgoing path of the cutting blades 8,9,37,38 limited and thus the countersink diameter 30 is after Figure 3 set exactly. According to Figure 1, the two aligned through holes 2.3 are now aligned front and back

be deburred, with well-defined chamfers 4-7 to be attached.

In this case, cutting blades 8, 9 are used, as shown in more detail in FIG. The cutting blades are in this case in a radially aligned receptacle 11 of the cutting tool. 1

slidably mounted under the spring force of a rotatably mounted in arrow directions 29 rocker 23.

For the sake of simplicity, only a single cutting blade will be described with reference to FIG

opposite cutting blade is formed exactly identical.

Of course, only a single cutting blade can be arranged in a cutting tool. Each of the cutting blades 8,9 has an upper and lower horizontal guide surface 10, with which the cutting blade in the Recording 11 is slidably mounted with little play. At the guide surface 10, a cutting edge 13 connects radially outwardly, which in the present embodiment a Angle 18 of z. B. 45 ° with the vertical 32 forms. It goes without saying that the angle 18 is changed within wide limits

can be; this angle later defines the angle of chamfers 4-7.

According to the invention, a sliding part 14, which does not intersect, now adjoins the cutting edge 13 at an angle thereof. The Slide has this angle 33 of z. B. 40 ° to the vertical 32nd It is important that the angles 18 and 33 differ from each other and that the angle 33 is smaller than the angle 18 of Cutting edge 13 to the vertical 32, because only thereby the cutting edge 13 can be ground cheaply without the Sliding section 14 to injure and also the sliding part 14 thereby achieves a greater conicity, so that the Cutting knife 8.9 can easily retract under the action of the Ausschubdruckes in the tool body when the Retract the cutting blade into the through hole 2. The transition between the cutting edge 13 and the sliding portion 14 is thus defined by the countersink diameter 30 and is at Position 22 given. The sliding part 14 in turn merges into a vertically directed sliding radius 20, which also does not work. Thus, as soon as the cutting tool 1 has made the chamfer 4 of Figure 1, wherein the chamfer 4 by the countersink diameter 30th

is defined, the cutting tool 1 moves further in the feed direction in the through hole 2, whereby the

Cutting knife 8,9 under the action against the spring force in the tool body in the opposite direction to the arrow 21st

move back and in this case the sliding part 14 slides along the chamfer 4 and enters the bore diameter 35.

Thus, the sliding part 14 can no longer change the chamfer 4, which is attached in a precisely defined manner, and which now becomes effective Sliding radius 20 is then applied to the bore diameter 35 and this is also not damaged. When driving through in the feed direction 34 through the bore 2, the attachment of the chamfer 5 takes place in an analogous manner. As well

The bevels 6 and 7 are mounted in the region of the through hole 35 in an analogous manner.

FIG. 8 shows again schematically the operation of the knives 8, 9 of this first embodiment, with the tool head in FIG Starting position, shown. The angle of material removal and thus the chamfer 4, corresponds to the angle 18 of the Cutting edge 13 of the knife 8,9 to the vertical. In one embodiment of the present invention is for these knives 8,9 still a special shape of the Spanleitstufe 12 provided. Due to the special design of Spanleitstufe 12 ensures that the of the Cutting edge 13 generated chips are cheaply dissipated without jamming on the chip breaker 12 or wedging

can.

So far, it was only known to run the chip guide edge 17 exactly parallel to the cutting edge 13, i. it

there was no angle 16 between these two edges 13,17.

According to the invention it is now provided that an angle 16 is provided between the two edges 13,17, so that the Spanleitkante 17 conically widening from the cutting edge 13 and the thus forming chips to the outside

be removed in the radial direction without being able to wedge between the cutting edge 13 and the chip guide edge 17.

In a preferred embodiment, the angle 16 z. B. in the range of 5 ° to 10 °. The cutting blade 8.9 is exactly symmetrical to the longitudinal center line, so that exactly the same on the lower half of Figure 3 Conditions exist. The Spanleitkanten 17 meet at position 36 in the vicinity of the sliding radius 20, but are due to technical reasons of Sliding radius 20 removed because when grinding the Spanleitstufe results in such a shape. It is preferred in this case if the Spanleitkante 17 assumes an angle 15 of about 40 ° in the direction of the vertical, because here

a favorable spanableitende effect is given.

In summary, to determine this first embodiment, that according to Figure 4 by the rotation angle limiting the Rocker radially outward in the direction of arrow 21 which limits the outward movement of the cutting blade 8,9, it is possible

a gonau defined chamfer 4-7 of z. B. 12.4 mm diameter, at a specified angle of z. 45 ° and a bore diameter 35 of e.g. 12mm. The effect of the cutting edges 13 is precisely limited because of the

Front of the cutting edges a sliding part 14 connects your turn in a non-machined sliding radius 20th

passes.

Hereinafter, a second embodiment dos cutting knife will now be described. With reference to these second embodiment of a device according to the invention shown in FIGS. 5 to 7 and 9 Cutting knife 37,38 in view of the first embodiment of the knife 8,9 shown in Figures 1 to 4 and 8 is to

note that the cutting edge 13 of the cutting blades 8,9 in its angular position (angle 18 to the vertical 32) equal to the

Countersink angle and thus the angle of the introduced chamfer 4,5, β or 7 to the longitudinal axis of the through hole 2 or 3. On

another angle requires a cutting blade 8.9 with a different angular position to the vertical.

In addition, the demand arose, not just straight bevels at any angle to the longitudinal axis of the To make through-hole, but also to create chamfers, which are curved on average, d. H. the average

are concave, convex, or have any other curved shape.

For this purpose, a cutting blade shown in FIGS. 1 to 4 and 8 would no longer be suitable. It is therefore proposed a cutting blade, as shown in Figures 5 to 7. The cutting mechanism of this Knife is shown in FIG. It can be seen that the cutting blade 37 (37 and 38 in Figure 9) of the second embodiment of this invention a Cutting edge 13 which lies in the horizontal, that is, at a right angle 19 to the vertical 32nd Depending on the shape of the sliding part 14, the chamfer 4,5 can now have an almost arbitrary shape. As previously

mentioned, the sliding part, adapted to the respective requirement, can be concave, convex or irregularly curved, always starting from a straight, horizontal cutting edge 13, and only the sliding part 14 (see FIGS. 5 and 7) curved according to the desired shape of the chamfer is executed. The angle 33 and the shape of the sliding portion 14 thus defines and defines in this embodiment of the cutting blade 37, 38 the countersink angle and the shape of the chamfer.

Examples of a possible shaping of the sliding part 14 are shown in FIG. It is there recognizable that in addition to the rectilinear sliding portion 14 and a concave Gleitpartio 14 'or 14 "could be provided, and instead of just trained chamfer 4 and 5 of Figure 9, would then a mirror-inverted bevel 5' and the fifth "result in accordance with the dashed entry in Figure 5 in the workpiece.

This means that mirror image of the shape of the sliding portion 14 of the cutting blade 37, 38 the chamfer 4.5 in the bore

of the workpiece is introduced. It is always a prerequisite that the cutting edge 13 is aligned in the horizontal, as shown in Figures 5 and 9.

However, the fact that the cutting edge 14 is preferably arranged horizontally is for the practice of the present invention Invention not mandatory. This cutting edge can also take any other angle to the horizontal;

However, the angles must not deviate too far from the horizontal, otherwise the function of a cutting blade 8.9 after

Figure 8 is achieved while actually a cutting mechanism according to Figu. 9 is desired for certain reasons. Important in the cutting blade 37,38 of Figures 5 and 7 is thus the fact that, starting from a horizontal Cutting edge 13, thereon a non-cutting, the sliding radius 20 radially outwardly angled sliding portion 14 connects, the in

a relatively wide range may have any shape, as shown for example with the sliding part 14 'or 14 ".

The sliding part 14 extends, as already mentioned, to the sliding radius 20, which runs parallel to the vertical 32. From Figure 7 it can be seen that the transition from the cutting edge 13 into the sliding part 14 in the form of a curved Curve at position 22 extends. The cutting edge 13 has a positive bevel and thus a positive cut, while the sliding part 14,14 'and 14 "

has a negative bevel to avoid a cutting action.

Incidentally, it can still be seen from FIG. 6 on the cutting blade 37 shown therein that the chip-guiding edge 17 no longer exists

is formed at an angle, as provided in the Schneidm6ssern 8.9 of Figure 3, but that here the Spanleitkanteeiner curved line follows, with a radius of curvature which is variable within wide limits. The smaller the radius of curvature of this chip breaker 12, the sharper and more aggressive the cutting action of the cutting knife.

From the figure 6 can still be seen that of the Spanleitstufe 12 obliquely forward towards the front of the cutting blade

a free-angle edge 42 extends, which has an angle 41 to the horizontal.

Important in this cutting blade 37,38 of chip removal, as shown in Figure 9, namely, that with the Cutting edge 13 a horizontal erosion effect can be achieved in the cutting plane 40, wherein - as before

mentioned-the shape of the chamfer can be arbitrarily curved on average, which in turn depends on the shape of the

Sliding part 14 is dependent.

Claims (10)

1. Deburring tool with cutting blade for deburring the edges of through holes on both sides with at least one cutting knife, consisting of a rectangular, card-shaped cutting body with material-removing cutting edges, with undercut ground clearance surfaces and with a frontal contact surface on the cutter head to rest on the inner surface of the bore, characterized in that, in the direction of the axially outer part of the cutting blade (8, 9; 37, 38), a sliding part (14) deviating from the angle (18) of the cutting edge (13) is provided which can be further divided into a front side of the cutting blade (8, 9) 37, 38) passes over a trained sliding radius (20). 2. deburring tool according to claim 1, characterized in that the cutting edge (13) of the cutting angle parallel to the intended angle cutting blade (8,9) at an angle (18) of about 45 ° and the sliding part (14) at an angle (33) of about 40 ° to the vertical (32) is arranged. 3. Deburring tool according to claim 2, characterized in that with respect to the cutting edge (13) of the cutting blade (8,9) a chip-guiding edge (17) is provided, wherein between the edges (13,17) an angle (16) is formed in such a way that the chip-guiding edge (17) moves away from the cutting edge (13) in a conically widening manner. 4. deburring tool according to claim 3, characterized in that the angle (16) has a range of 5 ° to 10 °. 5. deburring tool according to claim 3, characterized in that the Spanleitkante (17) in the direction of the vertical (32) occupies an angle of about 40 °. 6. deburring tool according to claim 1, characterized in that the cutting edge (13) of the perpendicular to the lowering direction cutting blade (37,38) at an angle (19) of 90 ° and the sliding part (14) in an arbitrarily smaller angle (33) to the vertical (32) is arranged. 7. deburring tool according to claim 6, characterized in that the sliding part (14) of the cutting blade (37,38) forms one of the cutting edge (13) outgoing and in the sliding radius (20) of the knife passing straight. 8. deburring tool according to claim 6, characterized in that the sliding part (14) of the cutting blade (37,38) from the cutting edge (13) starting i.nd in the sliding radius (20) of the blade (37,38) passing concave, convex (14 ', 14 ") or irregularly shaped. 9. deburring tool according to claim 7 and 8, characterized in that with respect to the cutting edge (13) of the cutting blade (37,38) a Spanleitkante (17) is provided, wherein between the edges (13,17) an angle (41) is formed, from which the Spanleitkante (17) exposes arcuate with a radius of curvature which is variable within wide limits. 10. deburring tool according to claim 1, characterized in that the cutting edge (13) is adjusted in the transition to the sliding part (14) with respect to the size of the chamfer to be created by means of a pressure point screw (26) in the cutting tool.